Means for supporting vibrating screens



Dec. 6, 1927. 1,651,934 A. J. SAYERS MEANS FOR SUPPORTING VIBRATINGSCREENS Filed Feb. 21. 1925 2 Sheets-Sheet l Dec. 6,1927. v 1,651,934

A. J. SAYERS MEANS FOR SUPPORTING VIBRATING SCREENS Filed Feb. 21. 19252 $heets+Sheet awvwntpz Patented Dec. 6, 1927.

UNITED STATES ALBERT J. SAYERS,

OF CHICAGO, ILLINOIS, ASSIGNOR TO LINK-BELT COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEANS FOR'SUPPORTING VIBRATING SCREENS.

Application filed February 21, 1925. Serial No. 10,741.

This invention relates, in a preferred form, to the use of coiledsprings for suspending vibrating screens and has for its object theprovision of coiled spring members for supporting the greater part ofthe screen load, to thus replace the heavy spiral sprmgsun part orwhole. I further aim to provlde means which will overcome the tendencyof the supporting spring leaves to sag and thereby reduce the efliciencyof the unbalanced pulley, and whereby the screen v1- brates more easilywith a minimum expendi ture of efiort. A further object includes theprovision of simple and inexpensive means for supporting screens oflarge capacity so that the same spiral springs will serve in supportingthe varied sizes of vibrating screens.

Other objects will appear hereinafter and I attain these objects by theconstruction exemplified in the accompanying drawings, in which 4 Fig. 1is a side elevation of a vibrating screen to which my invention isapplied.

Fig. 2 is a sectional view taken on the line 22 of Fig. 1.

Fig. 3 is a View showing the spring support applied from beneath.

Fig. 4 is a View of r'orm of construction wherein the spring issupplemented by counter weights.

Fig. 5 is a invention.

Like numerals refer to similar parts in the views.

It is found that the constant vibrations of the coiled spring leavesunder heavy loads tends to sag the leaves so that the springs becomesluggish and thereby the efficiency of the overbalanced pulley isdestroyed. By the use of auxiliary supporting devices, as coiled springsor counter weights and equalizing means, the greater portion of theweight of a vibrating screen and load is sup- 1 ported thereby, thuspermitting the use of larger vibrating screens and the handling ofgreater quantities of material on a single screen without the necessityof proportionally increasing the size and weight of the iral springs.Screens thus supported have greater freedom and most effectively respondto the overbalancing element. This. provision also permits the use of a.standard spiral spring for varying sizes of screens, thus i economizingin the manufacture as to the view of a modified form of my production ofspiral springs for the varying efl'ective loads to be supported.

Referring now to the drawing, 10 denotes a screen box which may assumeany variety of forms and is here provided with one or more screeningcloths 1 1 and 12. These cloths are held stretched by stretching members13 which in'this instance are shown in the form of beams held inposition by bolts 14 and guides 15. Near each end of the screen box asupporting member or bar 16 is secured in the blocks 17 on the top beams17 of the screen box 10. Collars 18 are shrunken on bars 16 near theends and adjacent these collars the usual spiral springs 19 arefastened, in any suitable manner, as by weld-' ing. The outer leaves ofthe spiral springs are secured to housings 20, which in turn rest on thesupporting beams 21. To the ends of bars- 16 are attached supportinglinks 22, which engage the spring members 23 or cables 36 and counterweights. These members constitute the auxiliary supports and aresuspended from suitable beams 24. In place of the vertical springscables 36 may be used. 80 These are attached to links 22 and pass overpulleys 35, thence to weights 36 or to a common horizontal spring 37, tothus supplement and relieve the spiral springs 19 for the purpose statedabove. A turnbuckle 38 is provided to take up slack.

Instead of suspending the screen box and load as shown in Figs. 1 and 2,it may, in some instances, be desirable to support the same frombeneath. I have shown one-way of accomplishing this method of support byuse of a vertical spring 25 resting on a base 26 and secured to the bar16 by a plate 27 asillustrated, for example, in Fig. 3. In either casedo the auxiliary coiled spring members freely support the screen box,and when used in conjunction with the coiled springs, it will beunnecessary to provide heavy coiled springs for large screen boxes andheavy loads. With the use of myinvention, heavy spiral springs are notrequired. In fact, under certain conditions I may dispense with the useof the spiral springs entirely and rely solely upon the coiled springs.Screens thus suspended either with the combined coiled and spiralsprings or with the coiled springs only, are caused to vibrate by anoverbalanced pulley 30 which is secured in a frame 31 and this frame isfastened on to the top beams 17 of the screen 110 box 10. When thepulley is rotated at a high rate, the overbalanced effect is imparted tothe screen box for screening materials in the manner known to the art.The greater freedom of movement due to the use of long coiled springsprovides means also for operating the screens more efiiciently and withless wear and ear.

While I have shown a specific form of my invention, applied to aparticular screening device, I do not thereby desire to be understood asthus limiting myself unduly.

What I claim, therefore, as new and useful, of my own invention anddesire to secure by Letters Patent, is

1. In a vibrating screen, a screen box, means for vibrating said box,means for flexibly supporting said box, and auxiliary supporting meansfor maintaining said first named means supple, said supporting andauxiliary supporting means being positively connected together.

2. In a vibrating screen, a screen box, means for vibrating said box,\sprin members for supporting said box, and adc itional spring membersfor assisting in carrying the load and the screen box, said springmembers being directl connected together.

3. In a vi rating screen, a screen box, means for vibrating said box,means for resilientlysupportin said screen box to freely impartvibrations t iereto, said means including long coiled springscooperating with splral springs to maintain flexibility of said springsunder varyin axes of the coiled an spiral springs being at right anglesto each other.

4. In a vibratory screen, a screen box, means for vibrating said box,and coiled load conditions the springs for supporting said screen box toerm1t vibration thereof and resilient means or supporting all of saidstructure.

-5. In a vibratory screen, a screen box having screening means, anoverbalanced pulley for vibrating said screen box and screening means,bar members carried by said box, spring members securedon said barmembers near the ends thereof and auxiliary spring members attached tothe bar members adjacent the ends thereof whereby the load on said firstnamed spring members is relieved said auxiliary spring memberssupporting all of said structure.

6. In a vibratory screen, a screen box having screening means, anoverbalanced pulley for vibrating said screen box and screening means,bar members carried by said box, spiral springs secured to said barsnear the ends thereof encircling them, spring supporting anchors appliedto the ends of said bars adjacent said spiral springs and spring memberssu ported byv said anchors.

7. In a vi ratory screen, a screen box having screening means, anoverbalanced pulley for vibrating said screen box and screening means,bar members carried by said box, splral springs secured to said barsnear the ends thereof, spring supporting anchors applied to the ends ofsald bars adjacent said spiral sprin s, and coiled springs-supported bysaid anc ors for relieving said spiral springs, said coiled springsbeing arranged for supporting all of said structure.

In testimony whereof I have hereunto set w my hand on this 30thday ofJanuary, A. D., 1925.

ALBERT J. SAYERS.

